Casio Baby-G Slim Marine Ladies Watch BG1300MB-1 Shock Resistant, 100M Water Resistant, EL Backlight with Afterglow World Time, 4 Daily Alarms & 1 Snooze Alarm, Countdown Timer Button Operation Tone On/Off, Auto Calendar (pre-programmed until the year 2099), 12/24 Hour Formats Accuracy +/-30 seconds per month, Battery CR1616, Approx. battery life: 3 years Module 3120, Size of case/total weight: 41.6 x 37.0 x 12.3mm / 38g